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Gas Turbine Repair Technology components, (e.g. stub shafts, blade and wheel assemblies, distance pieces, and turbine wheels and spacers). These components are assembled into major subassemblies using a computer stacking program to minimize any runouts of the assembly. GE has developed specialized tooling for FA class compressor rotor applica- tions to improve the rotor straightness and min- imize runout. (Seee Figure 17.) are taken using a balance beam system to simu- late the distance of the bucket from the rota- tional axis. The unit is computerized to record the measurements and run a program to select the bucket order (charting) that minimizes im- balance for that set of hardware. Records are kept so that in some cases if a bucket is dam- aged in service and needs to be exchanged, it can be done so with a bucket of similar weight without the need to re-weigh the entire set of buckets. The major subassemblies, which consist of the compressor and turbine rotor assemblies, are then balanced in two balancing planes. With a single-shaft, two-bearing unit, such as MS5001, MS6001, MS7001F, or MS9001F, the mated compressor and turbine rotors are final-bal- anced by adding correction weights distributed in three or four planes according to axial rotor mass distribution. GE global service centers have the factory-spec- ified balance equipment and the skilled trained technicians to meet the design criteria outlined. Service center engineering personnel are linked to the GE Energy Services Product Serv- ice organization to support critical rotor issues as they arise during outages or on-site inspec- tion processes. Further, in 1994, GE introduced transportable low-speed balance systems capa- ble of performing the rotor inspection and bal- ance operations at the customer’s plant site. This has helped to reduce customer costs dra- matically and determine rotor characteristics at the site very quickly. Optimizing your rotor may involve upgrading with advanced components during the outage cycle. This effort has been shown to enhance the performance of your turbine dramatically. GE service centers are poised to help customers understand what it takes to get the most power from the turbines in place or to contact our web Figure 17. 7FA compressor with GE’s multi-bolt tensioning device GE recommends that each row of rotor blades and buckets be moment weighed and charted prior to installation to ensure the balance of the rotor. GE service centers are equipped to per- form this type of work with highly accurate mo- ment weighing and charting equipment. (See Figure 18.) The moment weight measurements Figure 18. Bucket weighing and charting equipment GE Power Systems ■ GER-3957B ■ (04/01) 11PDF Image | Gas Turbine Repair Technology GE
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